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### Checkpoint cumulative updates
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Starting with Windows 11, version 24H2, the latest cumulative update may have a prerequisite cumulative update that is required to be installed first. These are known as checkpoint cumulative updates. In these cases, the cumulative update file level differentials are based on a previous cumulative update instead of the Windows RTM release. The benefit is a smaller update package and faster installation.
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Starting with Windows 11, version 24H2, the latest cumulative update may have a prerequisite cumulative update that is required to be installed first. These are known as checkpoint cumulative updates. In these cases, the cumulative update file level differentials are based on a previous cumulative update instead of the Windows RTM release. The benefit is a smaller update package and faster installation. When you obtain the latest cumulative update from the [Microsoft Update Catalog](https://catalog.update.microsoft.com), checkpoint cumulative updates will be available from the download button. In addition, the knowledge base article for the cumulative update will provide additional information.
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To install the checkpoint(s) when servicing the Windows OS (steps 9 & 12) and WinPE (steps 17 & 23), call `Add-WindowsPackage` with the target cumulative update. The folder from `-PackagePath` will be used to discover and install one or more checkpoints as needed. Only the target cumulative update and checkpoint cumulative updates should be in the `-PackagePath` folder. Cumulative update packages with a revision <= the target cumulative update will be processed. If you are not customizing the image with additional languages and/or optional features, then separate calls to `Add-WindowsPackage` (checkpoint cumulative updates first) can be used for steps 9 & 17 above. Separate calls cannot be used for steps 12 and 23.
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